Unknown manufacturer: (b)(4).Medical device expiration date: unknown.Device manufacture date: unknown.(b)(4).Investigation summary: as no physical sample, picture sample, material number, or valid lot number was provided for evaluation by our quality engineer team, a complete investigation could not be performed.There are current quality controls in place to detect this type of product malfunction during the production process.As a neither a valid lot number nor a material number were known for this incident, a device history record review could not be completed.Investigation conclusion: complaints received for this device and reported condition will continue to be tracked and trended.Our quality team regularly reviews the collected data for identification of emerging trends.Root cause description: based on the limited investigation results, a cause for the reported incident could not be determined.Rationale: no sample, no material number, no valid lot - closed at dchu to no findings.
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